22
IMM AGS-2
Figure 17, Flow Switch
Operating Limits:
Maximum standby ambient temperature, 130
°
F (55
°
C)
Maximum operating ambient temperature, see below
Minimum operating ambient temperature (standard), 35
°
F (2
°
C)
Minimum operating ambient temperature (optional low-ambient control), 0
°
F (-18
°
C)
Leaving chilled water temperature, 40
°
F to 60
°
F (4
°
C to 16
°
C)
Leaving chilled fluid range (with anti-freeze), 20
°
F to 60
°
F (-7
°
C to 16
°
C). Unloading is
not permitted with fluid leaving temperatures below 30
°
F (-1
°
C).
Operating Delta-T range, 6 degrees F to 16 degrees F (10.8 C to 28.8 C)
Maximum operating inlet fluid temperature, 76
°
F (24
°
C)
Maximum startup inlet fluid temperature, 90
°
F (32
°
C)
Maximum non-operating inlet fluid temperature, 100
°
F (38
°
C)
NOTE
: Contact the local McQuay sales office for operation outside any of these limits.
Maximum Operating Ambient Temperatures
Standard Efficiency,
designated by a "0" as the last digit in the model number (such as
AGS 170C) are designed for operation up to 125 degrees. Significant unloading above 115
degrees can occur depending on a variety of factors. Contact your sales representative for
performance above 115 degrees. Additional unloading can result with leaving water
temperatures above 45 degrees.
High Efficiency,
designated by a "5" as the last digit in the model number (such as AGS
175C) are designed for operation up to 125 degrees without unloading for leaving water
temperatures between 40 and 45 degrees Fahrenheit. Contact your sales representative for
evaporator duty outside of this range. The High Efficiency models have larger components,
and/or more fans than the comparable Standard Efficiency models. This results in
improved efficiency and the ability to operate at higher ambient air temperatures.
High Ambient Option
, A factory-installed option that provides components allowing
operation in high ambient temperature locations. It can be applied to any unit and is
mandatory on:
1.
All units with the optional VFD low ambient control.
2.
All units that can have operating ambient temperatures above 115
°
F (46
°
C).
Flow Switch
A flow switch must be included in the
chilled water system to prove that there is
adequate water flow to the evaporator
before the unit can start. It also serves to
shut down the unit in the event that water
flow is interrupted in order to guard
against evaporator freeze-up.
A solid state flow switch that is factory-
mounted and wired in the chiller leaving
water nozzle is available as an option.
A flow switch for field mounting and
wiring in the leaving chilled water is also
available as an option from McQuay under
Flow direction marked
on switch
1" (25mm) NPT flow
switch connection
Tee
1 1/4" (32mm) pipe
dia. min. before switch
1 1/4" (32mm) pipe
dia. min. after switch
